ARM: report present cpus instead of online CPUs
[linux-2.6.git] / fs / binfmt_elf_fdpic.c
index fdeadab..30745f4 100644 (file)
@@ -25,6 +25,7 @@
 #include <linux/fcntl.h>
 #include <linux/slab.h>
 #include <linux/pagemap.h>
+#include <linux/security.h>
 #include <linux/highmem.h>
 #include <linux/highuid.h>
 #include <linux/personality.h>
@@ -33,6 +34,7 @@
 #include <linux/elf.h>
 #include <linux/elf-fdpic.h>
 #include <linux/elfcore.h>
+#include <linux/coredump.h>
 
 #include <asm/uaccess.h>
 #include <asm/param.h>
@@ -74,14 +76,14 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(struct elf_fdpic_params *,
 static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *,
                                             struct file *, struct mm_struct *);
 
-#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
-static int elf_fdpic_core_dump(long, struct pt_regs *, struct file *, unsigned long limit);
+#ifdef CONFIG_ELF_CORE
+static int elf_fdpic_core_dump(struct coredump_params *cprm);
 #endif
 
 static struct linux_binfmt elf_fdpic_format = {
        .module         = THIS_MODULE,
        .load_binary    = load_elf_fdpic_binary,
-#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
+#ifdef CONFIG_ELF_CORE
        .core_dump      = elf_fdpic_core_dump,
 #endif
        .min_coredump   = ELF_EXEC_PAGESIZE,
@@ -167,12 +169,12 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
        struct elf_fdpic_params exec_params, interp_params;
        struct elf_phdr *phdr;
        unsigned long stack_size, entryaddr;
-#ifndef CONFIG_MMU
-       unsigned long fullsize;
-#endif
 #ifdef ELF_FDPIC_PLAT_INIT
        unsigned long dynaddr;
 #endif
+#ifndef CONFIG_MMU
+       unsigned long stack_prot;
+#endif
        struct file *interpreter = NULL; /* to shut gcc up */
        char *interpreter_name = NULL;
        int executable_stack;
@@ -243,8 +245,7 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
                         * mm->dumpable = 0 regardless of the interpreter's
                         * permissions.
                         */
-                       if (file_permission(interpreter, MAY_READ) < 0)
-                               bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
+                       would_dump(bprm, interpreter);
 
                        retval = kernel_read(interpreter, 0, bprm->buf,
                                             BINPRM_BUF_SIZE);
@@ -285,20 +286,23 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
        }
 
        stack_size = exec_params.stack_size;
-       if (stack_size < interp_params.stack_size)
-               stack_size = interp_params.stack_size;
-
        if (exec_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
                executable_stack = EXSTACK_ENABLE_X;
        else if (exec_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
                executable_stack = EXSTACK_DISABLE_X;
-       else if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
-               executable_stack = EXSTACK_ENABLE_X;
-       else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
-               executable_stack = EXSTACK_DISABLE_X;
        else
                executable_stack = EXSTACK_DEFAULT;
 
+       if (stack_size == 0) {
+               stack_size = interp_params.stack_size;
+               if (interp_params.flags & ELF_FDPIC_FLAG_EXEC_STACK)
+                       executable_stack = EXSTACK_ENABLE_X;
+               else if (interp_params.flags & ELF_FDPIC_FLAG_NOEXEC_STACK)
+                       executable_stack = EXSTACK_DISABLE_X;
+               else
+                       executable_stack = EXSTACK_DEFAULT;
+       }
+
        retval = -ENOEXEC;
        if (stack_size == 0)
                goto error;
@@ -315,6 +319,11 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
         * defunct, deceased, etc. after this point we have to exit via
         * error_kill */
        set_personality(PER_LINUX_FDPIC);
+       if (elf_read_implies_exec(&exec_params.hdr, executable_stack))
+               current->personality |= READ_IMPLIES_EXEC;
+
+       setup_new_exec(bprm);
+
        set_binfmt(&elf_fdpic_format);
 
        current->mm->start_code = 0;
@@ -376,10 +385,15 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
        if (stack_size < PAGE_SIZE * 2)
                stack_size = PAGE_SIZE * 2;
 
+       stack_prot = PROT_READ | PROT_WRITE;
+       if (executable_stack == EXSTACK_ENABLE_X ||
+           (executable_stack == EXSTACK_DEFAULT && VM_STACK_FLAGS & VM_EXEC))
+               stack_prot |= PROT_EXEC;
+
        down_write(&current->mm->mmap_sem);
-       current->mm->start_brk = do_mmap(NULL, 0, stack_size,
-                                        PROT_READ | PROT_WRITE | PROT_EXEC,
-                                        MAP_PRIVATE | MAP_ANONYMOUS | MAP_GROWSDOWN,
+       current->mm->start_brk = do_mmap(NULL, 0, stack_size, stack_prot,
+                                        MAP_PRIVATE | MAP_ANONYMOUS |
+                                        MAP_UNINITIALIZED | MAP_GROWSDOWN,
                                         0);
 
        if (IS_ERR_VALUE(current->mm->start_brk)) {
@@ -389,11 +403,6 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
                goto error_kill;
        }
 
-       /* expand the stack mapping to use up the entire allocation granule */
-       fullsize = kobjsize((char *) current->mm->start_brk);
-       if (!IS_ERR_VALUE(do_mremap(current->mm->start_brk, stack_size,
-                                   fullsize, 0, 0)))
-               stack_size = fullsize;
        up_write(&current->mm->mmap_sem);
 
        current->mm->brk = current->mm->start_brk;
@@ -403,7 +412,7 @@ static int load_elf_fdpic_binary(struct linux_binprm *bprm,
        current->mm->start_stack = current->mm->start_brk + stack_size;
 #endif
 
-       compute_creds(bprm);
+       install_exec_creds(bprm);
        current->flags &= ~PF_FORKNOEXEC;
        if (create_elf_fdpic_tables(bprm, current->mm,
                                    &exec_params, &interp_params) < 0)
@@ -455,25 +464,42 @@ error_kill:
 }
 
 /*****************************************************************************/
+
+#ifndef ELF_BASE_PLATFORM
+/*
+ * AT_BASE_PLATFORM indicates the "real" hardware/microarchitecture.
+ * If the arch defines ELF_BASE_PLATFORM (in asm/elf.h), the value
+ * will be copied to the user stack in the same manner as AT_PLATFORM.
+ */
+#define ELF_BASE_PLATFORM NULL
+#endif
+
 /*
- * present useful information to the program
+ * present useful information to the program by shovelling it onto the new
+ * process's stack
  */
 static int create_elf_fdpic_tables(struct linux_binprm *bprm,
                                   struct mm_struct *mm,
                                   struct elf_fdpic_params *exec_params,
                                   struct elf_fdpic_params *interp_params)
 {
+       const struct cred *cred = current_cred();
        unsigned long sp, csp, nitems;
        elf_caddr_t __user *argv, *envp;
        size_t platform_len = 0, len;
-       char *k_platform;
-       char __user *u_platform, *p;
+       char *k_platform, *k_base_platform;
+       char __user *u_platform, *u_base_platform, *p;
        long hwcap;
        int loop;
+       int nr; /* reset for each csp adjustment */
 
-       /* we're going to shovel a whole load of stuff onto the stack */
 #ifdef CONFIG_MMU
-       sp = bprm->p;
+       /* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
+        * by the processes running on the same package. One thing we can do is
+        * to shuffle the initial stack for them, so we give the architecture
+        * an opportunity to do so here.
+        */
+       sp = arch_align_stack(bprm->p);
 #else
        sp = mm->start_stack;
 
@@ -482,11 +508,14 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
                return -EFAULT;
 #endif
 
-       /* get hold of platform and hardware capabilities masks for the machine
-        * we are running on.  In some cases (Sparc), this info is impossible
-        * to get, in others (i386) it is merely difficult.
-        */
        hwcap = ELF_HWCAP;
+
+       /*
+        * If this architecture has a platform capability string, copy it
+        * to userspace.  In some cases (Sparc), this info is impossible
+        * for userspace to get any other way, in others (i386) it is
+        * merely difficult.
+        */
        k_platform = ELF_PLATFORM;
        u_platform = NULL;
 
@@ -498,19 +527,20 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
                        return -EFAULT;
        }
 
-#if defined(__i386__) && defined(CONFIG_SMP)
-       /* in some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
-        * by the processes running on the same package. One thing we can do is
-        * to shuffle the initial stack for them.
-        *
-        * the conditionals here are unneeded, but kept in to make the code
-        * behaviour the same as pre change unless we have hyperthreaded
-        * processors. This keeps Mr Marcelo Person happier but should be
-        * removed for 2.5
+       /*
+        * If this architecture has a "base" platform capability
+        * string, copy it to userspace.
         */
-       if (smp_num_siblings > 1)
-               sp = sp - ((current->pid % 64) << 7);
-#endif
+       k_base_platform = ELF_BASE_PLATFORM;
+       u_base_platform = NULL;
+
+       if (k_base_platform) {
+               platform_len = strlen(k_base_platform) + 1;
+               sp -= platform_len;
+               u_base_platform = (char __user *) sp;
+               if (__copy_to_user(u_base_platform, k_base_platform, platform_len) != 0)
+                       return -EFAULT;
+       }
 
        sp &= ~7UL;
 
@@ -540,12 +570,13 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
        }
 
        /* force 16 byte _final_ alignment here for generality */
-#define DLINFO_ITEMS 13
+#define DLINFO_ITEMS 15
 
-       nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0);
-#ifdef DLINFO_ARCH_ITEMS
-       nitems += DLINFO_ARCH_ITEMS;
-#endif
+       nitems = 1 + DLINFO_ITEMS + (k_platform ? 1 : 0) +
+               (k_base_platform ? 1 : 0) + AT_VECTOR_SIZE_ARCH;
+
+       if (bprm->interp_flags & BINPRM_FLAGS_EXECFD)
+               nitems++;
 
        csp = sp;
        sp -= nitems * 2 * sizeof(unsigned long);
@@ -557,39 +588,61 @@ static int create_elf_fdpic_tables(struct linux_binprm *bprm,
        sp -= sp & 15UL;
 
        /* put the ELF interpreter info on the stack */
-#define NEW_AUX_ENT(nr, id, val)                                       \
+#define NEW_AUX_ENT(id, val)                                           \
        do {                                                            \
                struct { unsigned long _id, _val; } __user *ent;        \
                                                                        \
                ent = (void __user *) csp;                              \
                __put_user((id), &ent[nr]._id);                         \
                __put_user((val), &ent[nr]._val);                       \
+               nr++;                                                   \
        } while (0)
 
+       nr = 0;
        csp -= 2 * sizeof(unsigned long);
-       NEW_AUX_ENT(0, AT_NULL, 0);
+       NEW_AUX_ENT(AT_NULL, 0);
        if (k_platform) {
+               nr = 0;
                csp -= 2 * sizeof(unsigned long);
-               NEW_AUX_ENT(0, AT_PLATFORM,
+               NEW_AUX_ENT(AT_PLATFORM,
                            (elf_addr_t) (unsigned long) u_platform);
        }
 
+       if (k_base_platform) {
+               nr = 0;
+               csp -= 2 * sizeof(unsigned long);
+               NEW_AUX_ENT(AT_BASE_PLATFORM,
+                           (elf_addr_t) (unsigned long) u_base_platform);
+       }
+
+       if (bprm->interp_flags & BINPRM_FLAGS_EXECFD) {
+               nr = 0;
+               csp -= 2 * sizeof(unsigned long);
+               NEW_AUX_ENT(AT_EXECFD, bprm->interp_data);
+       }
+
+       nr = 0;
        csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
-       NEW_AUX_ENT( 0, AT_HWCAP,       hwcap);
-       NEW_AUX_ENT( 1, AT_PAGESZ,      PAGE_SIZE);
-       NEW_AUX_ENT( 2, AT_CLKTCK,      CLOCKS_PER_SEC);
-       NEW_AUX_ENT( 3, AT_PHDR,        exec_params->ph_addr);
-       NEW_AUX_ENT( 4, AT_PHENT,       sizeof(struct elf_phdr));
-       NEW_AUX_ENT( 5, AT_PHNUM,       exec_params->hdr.e_phnum);
-       NEW_AUX_ENT( 6, AT_BASE,        interp_params->elfhdr_addr);
-       NEW_AUX_ENT( 7, AT_FLAGS,       0);
-       NEW_AUX_ENT( 8, AT_ENTRY,       exec_params->entry_addr);
-       NEW_AUX_ENT( 9, AT_UID,         (elf_addr_t) current->uid);
-       NEW_AUX_ENT(10, AT_EUID,        (elf_addr_t) current->euid);
-       NEW_AUX_ENT(11, AT_GID,         (elf_addr_t) current->gid);
-       NEW_AUX_ENT(12, AT_EGID,        (elf_addr_t) current->egid);
+       NEW_AUX_ENT(AT_HWCAP,   hwcap);
+       NEW_AUX_ENT(AT_PAGESZ,  PAGE_SIZE);
+       NEW_AUX_ENT(AT_CLKTCK,  CLOCKS_PER_SEC);
+       NEW_AUX_ENT(AT_PHDR,    exec_params->ph_addr);
+       NEW_AUX_ENT(AT_PHENT,   sizeof(struct elf_phdr));
+       NEW_AUX_ENT(AT_PHNUM,   exec_params->hdr.e_phnum);
+       NEW_AUX_ENT(AT_BASE,    interp_params->elfhdr_addr);
+       NEW_AUX_ENT(AT_FLAGS,   0);
+       NEW_AUX_ENT(AT_ENTRY,   exec_params->entry_addr);
+       NEW_AUX_ENT(AT_UID,     (elf_addr_t) cred->uid);
+       NEW_AUX_ENT(AT_EUID,    (elf_addr_t) cred->euid);
+       NEW_AUX_ENT(AT_GID,     (elf_addr_t) cred->gid);
+       NEW_AUX_ENT(AT_EGID,    (elf_addr_t) cred->egid);
+       NEW_AUX_ENT(AT_SECURE,  security_bprm_secureexec(bprm));
+       NEW_AUX_ENT(AT_EXECFN,  bprm->exec);
 
 #ifdef ARCH_DLINFO
+       nr = 0;
+       csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
+
        /* ARCH_DLINFO must come last so platform specific code can enforce
         * special alignment requirements on the AUXV if necessary (eg. PPC).
         */
@@ -935,9 +988,11 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(
                        params->elfhdr_addr = seg->addr;
 
                /* clear any space allocated but not loaded */
-               if (phdr->p_filesz < phdr->p_memsz)
-                       clear_user((void *) (seg->addr + phdr->p_filesz),
-                                  phdr->p_memsz - phdr->p_filesz);
+               if (phdr->p_filesz < phdr->p_memsz) {
+                       if (clear_user((void *) (seg->addr + phdr->p_filesz),
+                                      phdr->p_memsz - phdr->p_filesz))
+                               return -EFAULT;
+               }
 
                if (mm) {
                        if (phdr->p_flags & PF_X) {
@@ -948,15 +1003,8 @@ static int elf_fdpic_map_file_constdisp_on_uclinux(
                                }
                        } else if (!mm->start_data) {
                                mm->start_data = seg->addr;
-#ifndef CONFIG_MMU
                                mm->end_data = seg->addr + phdr->p_memsz;
-#endif
                        }
-
-#ifdef CONFIG_MMU
-                       if (seg->addr + phdr->p_memsz > mm->end_data)
-                               mm->end_data = seg->addr + phdr->p_memsz;
-#endif
                }
 
                seg++;
@@ -1077,7 +1125,8 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
                 * PT_LOAD */
                if (prot & PROT_WRITE && disp > 0) {
                        kdebug("clear[%d] ad=%lx sz=%lx", loop, maddr, disp);
-                       clear_user((void __user *) maddr, disp);
+                       if (clear_user((void __user *) maddr, disp))
+                               return -EFAULT;
                        maddr += disp;
                }
 
@@ -1112,15 +1161,17 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
                if (prot & PROT_WRITE && excess1 > 0) {
                        kdebug("clear[%d] ad=%lx sz=%lx",
                               loop, maddr + phdr->p_filesz, excess1);
-                       clear_user((void __user *) maddr + phdr->p_filesz,
-                                  excess1);
+                       if (clear_user((void __user *) maddr + phdr->p_filesz,
+                                      excess1))
+                               return -EFAULT;
                }
 
 #else
                if (excess > 0) {
                        kdebug("clear[%d] ad=%lx sz=%lx",
                               loop, maddr + phdr->p_filesz, excess);
-                       clear_user((void *) maddr + phdr->p_filesz, excess);
+                       if (clear_user((void *) maddr + phdr->p_filesz, excess))
+                               return -EFAULT;
                }
 #endif
 
@@ -1151,27 +1202,7 @@ static int elf_fdpic_map_file_by_direct_mmap(struct elf_fdpic_params *params,
  *
  * Modelled on fs/binfmt_elf.c core dumper
  */
-#if defined(USE_ELF_CORE_DUMP) && defined(CONFIG_ELF_CORE)
-
-/*
- * These are the only things you should do on a core-file: use only these
- * functions to write out all the necessary info.
- */
-static int dump_write(struct file *file, const void *addr, int nr)
-{
-       return file->f_op->write(file, addr, nr, &file->f_pos) == nr;
-}
-
-static int dump_seek(struct file *file, loff_t off)
-{
-       if (file->f_op->llseek) {
-               if (file->f_op->llseek(file, off, SEEK_SET) != off)
-                       return 0;
-       } else {
-               file->f_pos = off;
-       }
-       return 1;
-}
+#ifdef CONFIG_ELF_CORE
 
 /*
  * Decide whether a segment is worth dumping; default is yes to be
@@ -1251,37 +1282,35 @@ static int notesize(struct memelfnote *en)
 
 /* #define DEBUG */
 
-#define DUMP_WRITE(addr, nr)   \
-       do { if (!dump_write(file, (addr), (nr))) return 0; } while(0)
-#define DUMP_SEEK(off) \
-       do { if (!dump_seek(file, (off))) return 0; } while(0)
+#define DUMP_WRITE(addr, nr, foffset)  \
+       do { if (!dump_write(file, (addr), (nr))) return 0; *foffset += (nr); } while(0)
 
-static int writenote(struct memelfnote *men, struct file *file)
+static int alignfile(struct file *file, loff_t *foffset)
 {
-       struct elf_note en;
+       static const char buf[4] = { 0, };
+       DUMP_WRITE(buf, roundup(*foffset, 4) - *foffset, foffset);
+       return 1;
+}
 
+static int writenote(struct memelfnote *men, struct file *file,
+                       loff_t *foffset)
+{
+       struct elf_note en;
        en.n_namesz = strlen(men->name) + 1;
        en.n_descsz = men->datasz;
        en.n_type = men->type;
 
-       DUMP_WRITE(&en, sizeof(en));
-       DUMP_WRITE(men->name, en.n_namesz);
-       /* XXX - cast from long long to long to avoid need for libgcc.a */
-       DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));      /* XXX */
-       DUMP_WRITE(men->data, men->datasz);
-       DUMP_SEEK(roundup((unsigned long)file->f_pos, 4));      /* XXX */
+       DUMP_WRITE(&en, sizeof(en), foffset);
+       DUMP_WRITE(men->name, en.n_namesz, foffset);
+       if (!alignfile(file, foffset))
+               return 0;
+       DUMP_WRITE(men->data, men->datasz, foffset);
+       if (!alignfile(file, foffset))
+               return 0;
 
        return 1;
 }
 #undef DUMP_WRITE
-#undef DUMP_SEEK
-
-#define DUMP_WRITE(addr, nr)   \
-       if ((size += (nr)) > limit || !dump_write(file, (addr), (nr))) \
-               goto end_coredump;
-#define DUMP_SEEK(off) \
-       if (!dump_seek(file, (off))) \
-               goto end_coredump;
 
 static inline void fill_elf_fdpic_header(struct elfhdr *elf, int segs)
 {
@@ -1333,7 +1362,7 @@ static inline void fill_note(struct memelfnote *note, const char *name, int type
 
 /*
  * fill up all the fields in prstatus from the given task struct, except
- * registers which need to be filled up seperately.
+ * registers which need to be filled up separately.
  */
 static void fill_prstatus(struct elf_prstatus *prstatus,
                          struct task_struct *p, long signr)
@@ -1341,25 +1370,22 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
        prstatus->pr_info.si_signo = prstatus->pr_cursig = signr;
        prstatus->pr_sigpend = p->pending.signal.sig[0];
        prstatus->pr_sighold = p->blocked.sig[0];
+       rcu_read_lock();
+       prstatus->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
+       rcu_read_unlock();
        prstatus->pr_pid = task_pid_vnr(p);
-       prstatus->pr_ppid = task_pid_vnr(p->parent);
        prstatus->pr_pgrp = task_pgrp_vnr(p);
        prstatus->pr_sid = task_session_vnr(p);
        if (thread_group_leader(p)) {
+               struct task_cputime cputime;
+
                /*
-                * This is the record for the group leader.  Add in the
-                * cumulative times of previous dead threads.  This total
-                * won't include the time of each live thread whose state
-                * is included in the core dump.  The final total reported
-                * to our parent process when it calls wait4 will include
-                * those sums as well as the little bit more time it takes
-                * this and each other thread to finish dying after the
-                * core dump synchronization phase.
+                * This is the record for the group leader.  It shows the
+                * group-wide total, not its individual thread total.
                 */
-               cputime_to_timeval(cputime_add(p->utime, p->signal->utime),
-                                  &prstatus->pr_utime);
-               cputime_to_timeval(cputime_add(p->stime, p->signal->stime),
-                                  &prstatus->pr_stime);
+               thread_group_cputime(p, &cputime);
+               cputime_to_timeval(cputime.utime, &prstatus->pr_utime);
+               cputime_to_timeval(cputime.stime, &prstatus->pr_stime);
        } else {
                cputime_to_timeval(p->utime, &prstatus->pr_utime);
                cputime_to_timeval(p->stime, &prstatus->pr_stime);
@@ -1374,6 +1400,7 @@ static void fill_prstatus(struct elf_prstatus *prstatus,
 static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
                       struct mm_struct *mm)
 {
+       const struct cred *cred;
        unsigned int i, len;
 
        /* first copy the parameters from user space */
@@ -1390,8 +1417,10 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
                        psinfo->pr_psargs[i] = ' ';
        psinfo->pr_psargs[len] = 0;
 
+       rcu_read_lock();
+       psinfo->pr_ppid = task_pid_vnr(rcu_dereference(p->real_parent));
+       rcu_read_unlock();
        psinfo->pr_pid = task_pid_vnr(p);
-       psinfo->pr_ppid = task_pid_vnr(p->parent);
        psinfo->pr_pgrp = task_pgrp_vnr(p);
        psinfo->pr_sid = task_session_vnr(p);
 
@@ -1401,8 +1430,11 @@ static int fill_psinfo(struct elf_prpsinfo *psinfo, struct task_struct *p,
        psinfo->pr_zomb = psinfo->pr_sname == 'Z';
        psinfo->pr_nice = task_nice(p);
        psinfo->pr_flag = p->flags;
-       SET_UID(psinfo->pr_uid, p->uid);
-       SET_GID(psinfo->pr_gid, p->gid);
+       rcu_read_lock();
+       cred = __task_cred(p);
+       SET_UID(psinfo->pr_uid, cred->uid);
+       SET_GID(psinfo->pr_gid, cred->gid);
+       rcu_read_unlock();
        strncpy(psinfo->pr_fname, p->comm, sizeof(psinfo->pr_fname));
 
        return 0;
@@ -1461,6 +1493,22 @@ static int elf_dump_thread_status(long signr, struct elf_thread_status *t)
        return sz;
 }
 
+static void fill_extnum_info(struct elfhdr *elf, struct elf_shdr *shdr4extnum,
+                            elf_addr_t e_shoff, int segs)
+{
+       elf->e_shoff = e_shoff;
+       elf->e_shentsize = sizeof(*shdr4extnum);
+       elf->e_shnum = 1;
+       elf->e_shstrndx = SHN_UNDEF;
+
+       memset(shdr4extnum, 0, sizeof(*shdr4extnum));
+
+       shdr4extnum->sh_type = SHT_NULL;
+       shdr4extnum->sh_size = elf->e_shnum;
+       shdr4extnum->sh_link = elf->e_shstrndx;
+       shdr4extnum->sh_info = segs;
+}
+
 /*
  * dump the segments for an MMU process
  */
@@ -1469,6 +1517,7 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                           unsigned long *limit, unsigned long mm_flags)
 {
        struct vm_area_struct *vma;
+       int err = 0;
 
        for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
                unsigned long addr;
@@ -1476,43 +1525,26 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                if (!maydump(vma, mm_flags))
                        continue;
 
-               for (addr = vma->vm_start;
-                    addr < vma->vm_end;
-                    addr += PAGE_SIZE
-                    ) {
-                       struct vm_area_struct *vma;
-                       struct page *page;
-
-                       if (get_user_pages(current, current->mm, addr, 1, 0, 1,
-                                          &page, &vma) <= 0) {
-                               DUMP_SEEK(file->f_pos + PAGE_SIZE);
-                       }
-                       else if (page == ZERO_PAGE(0)) {
-                               page_cache_release(page);
-                               DUMP_SEEK(file->f_pos + PAGE_SIZE);
-                       }
-                       else {
-                               void *kaddr;
-
-                               flush_cache_page(vma, addr, page_to_pfn(page));
-                               kaddr = kmap(page);
-                               if ((*size += PAGE_SIZE) > *limit ||
-                                   !dump_write(file, kaddr, PAGE_SIZE)
-                                   ) {
-                                       kunmap(page);
-                                       page_cache_release(page);
-                                       return -EIO;
-                               }
+               for (addr = vma->vm_start; addr < vma->vm_end;
+                                                       addr += PAGE_SIZE) {
+                       struct page *page = get_dump_page(addr);
+                       if (page) {
+                               void *kaddr = kmap(page);
+                               *size += PAGE_SIZE;
+                               if (*size > *limit)
+                                       err = -EFBIG;
+                               else if (!dump_write(file, kaddr, PAGE_SIZE))
+                                       err = -EIO;
                                kunmap(page);
                                page_cache_release(page);
-                       }
+                       } else if (!dump_seek(file, PAGE_SIZE))
+                               err = -EFBIG;
+                       if (err)
+                               goto out;
                }
        }
-
-       return 0;
-
-end_coredump:
-       return -EFBIG;
+out:
+       return err;
 }
 #endif
 
@@ -1523,11 +1555,9 @@ end_coredump:
 static int elf_fdpic_dump_segments(struct file *file, size_t *size,
                           unsigned long *limit, unsigned long mm_flags)
 {
-       struct vm_list_struct *vml;
-
-       for (vml = current->mm->context.vmlist; vml; vml = vml->next) {
-       struct vm_area_struct *vma = vml->vma;
+       struct vm_area_struct *vma;
 
+       for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
                if (!maydump(vma, mm_flags))
                        continue;
 
@@ -1543,6 +1573,17 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
 }
 #endif
 
+static size_t elf_core_vma_data_size(unsigned long mm_flags)
+{
+       struct vm_area_struct *vma;
+       size_t size = 0;
+
+       for (vma = current->mm->mmap; vma; vma = vma->vm_next)
+               if (maydump(vma, mm_flags))
+                       size += vma->vm_end - vma->vm_start;
+       return size;
+}
+
 /*
  * Actual dumper
  *
@@ -1550,8 +1591,7 @@ static int elf_fdpic_dump_segments(struct file *file, size_t *size,
  * and then they are actually written out.  If we run out of core limit
  * we just truncate.
  */
-static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
-                              struct file *file, unsigned long limit)
+static int elf_fdpic_core_dump(struct coredump_params *cprm)
 {
 #define        NUM_NOTES       6
        int has_dumped = 0;
@@ -1561,7 +1601,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
        int i;
        struct vm_area_struct *vma;
        struct elfhdr *elf = NULL;
-       loff_t offset = 0, dataoff;
+       loff_t offset = 0, dataoff, foffset;
        int numnote;
        struct memelfnote *notes = NULL;
        struct elf_prstatus *prstatus = NULL;   /* NT_PRSTATUS */
@@ -1573,11 +1613,11 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
        elf_fpxregset_t *xfpu = NULL;
 #endif
        int thread_status_size = 0;
-#ifndef CONFIG_MMU
-       struct vm_list_struct *vml;
-#endif
        elf_addr_t *auxv;
-       unsigned long mm_flags;
+       struct elf_phdr *phdr4note = NULL;
+       struct elf_shdr *shdr4extnum = NULL;
+       Elf_Half e_phnum;
+       elf_addr_t e_shoff;
 
        /*
         * We no longer stop all VM operations.
@@ -1613,7 +1653,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
                goto cleanup;
 #endif
 
-       if (signr) {
+       if (cprm->signr) {
                struct core_thread *ct;
                struct elf_thread_status *tmp;
 
@@ -1632,28 +1672,28 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
                        int sz;
 
                        tmp = list_entry(t, struct elf_thread_status, list);
-                       sz = elf_dump_thread_status(signr, tmp);
+                       sz = elf_dump_thread_status(cprm->signr, tmp);
                        thread_status_size += sz;
                }
        }
 
        /* now collect the dump for the current */
-       fill_prstatus(prstatus, current, signr);
-       elf_core_copy_regs(&prstatus->pr_reg, regs);
+       fill_prstatus(prstatus, current, cprm->signr);
+       elf_core_copy_regs(&prstatus->pr_reg, cprm->regs);
 
-#ifdef CONFIG_MMU
        segs = current->mm->map_count;
-#else
-       segs = 0;
-       for (vml = current->mm->context.vmlist; vml; vml = vml->next)
-           segs++;
-#endif
-#ifdef ELF_CORE_EXTRA_PHDRS
-       segs += ELF_CORE_EXTRA_PHDRS;
-#endif
+       segs += elf_core_extra_phdrs();
+
+       /* for notes section */
+       segs++;
+
+       /* If segs > PN_XNUM(0xffff), then e_phnum overflows. To avoid
+        * this, kernel supports extended numbering. Have a look at
+        * include/linux/elf.h for further information. */
+       e_phnum = segs > PN_XNUM ? PN_XNUM : segs;
 
        /* Set up header */
-       fill_elf_fdpic_header(elf, segs + 1);   /* including notes section */
+       fill_elf_fdpic_header(elf, e_phnum);
 
        has_dumped = 1;
        current->flags |= PF_DUMPCORE;
@@ -1680,7 +1720,7 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
 
        /* Try to dump the FPU. */
        if ((prstatus->pr_fpvalid =
-            elf_core_copy_task_fpregs(current, regs, fpu)))
+            elf_core_copy_task_fpregs(current, cprm->regs, fpu)))
                fill_note(notes + numnote++,
                          "CORE", NT_PRFPREG, sizeof(*fpu), fpu);
 #ifdef ELF_CORE_COPY_XFPREGS
@@ -1692,13 +1732,12 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
        fs = get_fs();
        set_fs(KERNEL_DS);
 
-       DUMP_WRITE(elf, sizeof(*elf));
        offset += sizeof(*elf);                         /* Elf header */
-       offset += (segs+1) * sizeof(struct elf_phdr);   /* Program headers */
+       offset += segs * sizeof(struct elf_phdr);       /* Program headers */
+       foffset = offset;
 
        /* Write notes phdr entry */
        {
-               struct elf_phdr phdr;
                int sz = 0;
 
                for (i = 0; i < numnote; i++)
@@ -1706,43 +1745,51 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
 
                sz += thread_status_size;
 
-               fill_elf_note_phdr(&phdr, sz, offset);
+               phdr4note = kmalloc(sizeof(*phdr4note), GFP_KERNEL);
+               if (!phdr4note)
+                       goto end_coredump;
+
+               fill_elf_note_phdr(phdr4note, sz, offset);
                offset += sz;
-               DUMP_WRITE(&phdr, sizeof(phdr));
        }
 
        /* Page-align dumped data */
        dataoff = offset = roundup(offset, ELF_EXEC_PAGESIZE);
 
-       /*
-        * We must use the same mm->flags while dumping core to avoid
-        * inconsistency between the program headers and bodies, otherwise an
-        * unusable core file can be generated.
-        */
-       mm_flags = current->mm->flags;
+       offset += elf_core_vma_data_size(cprm->mm_flags);
+       offset += elf_core_extra_data_size();
+       e_shoff = offset;
+
+       if (e_phnum == PN_XNUM) {
+               shdr4extnum = kmalloc(sizeof(*shdr4extnum), GFP_KERNEL);
+               if (!shdr4extnum)
+                       goto end_coredump;
+               fill_extnum_info(elf, shdr4extnum, e_shoff, segs);
+       }
+
+       offset = dataoff;
+
+       size += sizeof(*elf);
+       if (size > cprm->limit || !dump_write(cprm->file, elf, sizeof(*elf)))
+               goto end_coredump;
+
+       size += sizeof(*phdr4note);
+       if (size > cprm->limit
+           || !dump_write(cprm->file, phdr4note, sizeof(*phdr4note)))
+               goto end_coredump;
 
        /* write program headers for segments dump */
-       for (
-#ifdef CONFIG_MMU
-               vma = current->mm->mmap; vma; vma = vma->vm_next
-#else
-                       vml = current->mm->context.vmlist; vml; vml = vml->next
-#endif
-            ) {
+       for (vma = current->mm->mmap; vma; vma = vma->vm_next) {
                struct elf_phdr phdr;
                size_t sz;
 
-#ifndef CONFIG_MMU
-               vma = vml->vma;
-#endif
-
                sz = vma->vm_end - vma->vm_start;
 
                phdr.p_type = PT_LOAD;
                phdr.p_offset = offset;
                phdr.p_vaddr = vma->vm_start;
                phdr.p_paddr = 0;
-               phdr.p_filesz = maydump(vma, mm_flags) ? sz : 0;
+               phdr.p_filesz = maydump(vma, cprm->mm_flags) ? sz : 0;
                phdr.p_memsz = sz;
                offset += phdr.p_filesz;
                phdr.p_flags = vma->vm_flags & VM_READ ? PF_R : 0;
@@ -1752,16 +1799,18 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
                        phdr.p_flags |= PF_X;
                phdr.p_align = ELF_EXEC_PAGESIZE;
 
-               DUMP_WRITE(&phdr, sizeof(phdr));
+               size += sizeof(phdr);
+               if (size > cprm->limit
+                   || !dump_write(cprm->file, &phdr, sizeof(phdr)))
+                       goto end_coredump;
        }
 
-#ifdef ELF_CORE_WRITE_EXTRA_PHDRS
-       ELF_CORE_WRITE_EXTRA_PHDRS;
-#endif
+       if (!elf_core_write_extra_phdrs(cprm->file, offset, &size, cprm->limit))
+               goto end_coredump;
 
        /* write out the notes section */
        for (i = 0; i < numnote; i++)
-               if (!writenote(notes + i, file))
+               if (!writenote(notes + i, cprm->file, &foffset))
                        goto end_coredump;
 
        /* write out the thread status notes section */
@@ -1770,24 +1819,33 @@ static int elf_fdpic_core_dump(long signr, struct pt_regs *regs,
                                list_entry(t, struct elf_thread_status, list);
 
                for (i = 0; i < tmp->num_notes; i++)
-                       if (!writenote(&tmp->notes[i], file))
+                       if (!writenote(&tmp->notes[i], cprm->file, &foffset))
                                goto end_coredump;
        }
 
-       DUMP_SEEK(dataoff);
+       if (!dump_seek(cprm->file, dataoff - foffset))
+               goto end_coredump;
 
-       if (elf_fdpic_dump_segments(file, &size, &limit, mm_flags) < 0)
+       if (elf_fdpic_dump_segments(cprm->file, &size, &cprm->limit,
+                                   cprm->mm_flags) < 0)
                goto end_coredump;
 
-#ifdef ELF_CORE_WRITE_EXTRA_DATA
-       ELF_CORE_WRITE_EXTRA_DATA;
-#endif
+       if (!elf_core_write_extra_data(cprm->file, &size, cprm->limit))
+               goto end_coredump;
 
-       if (file->f_pos != offset) {
+       if (e_phnum == PN_XNUM) {
+               size += sizeof(*shdr4extnum);
+               if (size > cprm->limit
+                   || !dump_write(cprm->file, shdr4extnum,
+                                  sizeof(*shdr4extnum)))
+                       goto end_coredump;
+       }
+
+       if (cprm->file->f_pos != offset) {
                /* Sanity check */
                printk(KERN_WARNING
                       "elf_core_dump: file->f_pos (%lld) != offset (%lld)\n",
-                      file->f_pos, offset);
+                      cprm->file->f_pos, offset);
        }
 
 end_coredump:
@@ -1799,12 +1857,13 @@ cleanup:
                list_del(tmp);
                kfree(list_entry(tmp, struct elf_thread_status, list));
        }
-
+       kfree(phdr4note);
        kfree(elf);
        kfree(prstatus);
        kfree(psinfo);
        kfree(notes);
        kfree(fpu);
+       kfree(shdr4extnum);
 #ifdef ELF_CORE_COPY_XFPREGS
        kfree(xfpu);
 #endif
@@ -1812,4 +1871,4 @@ cleanup:
 #undef NUM_NOTES
 }
 
-#endif         /* USE_ELF_CORE_DUMP */
+#endif         /* CONFIG_ELF_CORE */